This document provides an overview of prehistory, including definitions of key terms like prehistory, archaeologist, anthropologist, and paleontologist. It describes the Paleolithic Age from 2.5 million BC to 8,000 BC, when people were nomadic hunter-gatherers using old stone tools. The Neolithic Age from 8,000 BC to 3,000 BC saw the development of polished stone tools, pottery, crop growing, animal domestication, and more sedentary lifestyles. It notes that the Agricultural Revolution, also called the Neolithic Revolution, led to increases in global temperature, planting of seeds, the beginning of agriculture, a food surplus, a dramatic rise in world population, and the